In a medium mixing bowl combine egg and Worcestershire sauce.
Stir in rye bread crumbs, mustard, pepper, and garlic powder.
Add ground beef and mix well.
Shape the meat mixture into twelve 1/4 inch thick patties.
Place about 2 tablespoons blue cheese atop each of 6 patties, Spread to within 1/2 inch of edges.
Top with remaining patties.
Press meat around edges to seal well.
Place patties on a rack in an unheated broiler pan.
Broil 3 to 4 inches from the heat about 13 minutes total or till done, turning once Or, grill patties, on an uncovered grill, directly over medium hot coals for 13 to 14 minutes total or till done, turning once.
Serve burgers on buns with alfalfa sprouts.